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J-VALVES
Design Features
One-piece Forged Body: The body and side covers are made of high-quality forged steel such as ASTM A105, A350 LF2, A182 F304/F316/F51, featuring dense and uniform material without casting defects. Its pressure-bearing capacity is significantly superior to castings, suitable for Class 600 and higher pressure ratings.
Three-Piece Structure: The valve consists of a main body and two side covers connected by bolts, featuring a compact design and convenient on-site disassembly and maintenance. Internal parts can be replaced without removing the valve from the pipeline, greatly reducing downtime.
Trunnion Mounted Design: The ball is fixed in the body by upper and lower support shafts and does not float under medium pressure. Sealing is achieved by spring-loaded seats, providing low and stable operating torque. It is ideal for high differential pressure and large-bore applications, eliminating the risk of high-pressure jamming associated with floating ball valves.
Double Piston Effect Seats (DPE): The seat design features a double piston effect structure. Medium pressure acts on the rear of the seat, pushing it tightly against the ball to realize bidirectional sealing. If one seat fails, the other can still maintain sealing, providing redundant protection.
Flanged End Connections: RF raised face or RTJ ring-type joint flanges are adopted in accordance with ASME B16.5, offering high compatibility with piping systems, easy installation and maintenance, and reliable sealing.
Emergency Seal & Grease Injection System: Sealant injection valves are installed in the seat area, allowing sealant injection to restore sealing performance in emergency situations and improving on-site emergency response capability.
Blowout-Proof & Anti-Static Stem: The stem adopts an integrally forged anti-blowout structure with a built-in anti-static spring or steel ball, ensuring electrical continuity between the ball, stem and body to eliminate static accumulation.
Optional DBB/DIB Function: Double Block & Bleed (DBB) or Double Isolation & Bleed (DIB‑1/DIB‑2) structures are available to meet pipeline isolation, pressure relief testing and safety locking requirements.
Low Operating Torque: With the trunnion-mounted ball design and low-friction bearings, the operating torque is only 30%–50% of that of equivalent floating ball valves. Smaller actuators can be used, reducing automation costs.
Technical Specifications
Size Range: NPS 2″ to 48″ (DN50 to DN1200)
Pressure Class: Class 150, Class 300, Class 600, Class 900 (PN20, PN50, PN100, PN150)
Temperature Range: -29℃ to +425℃
Body/Side Covers: ASTM A105, A350 LF2, A182 F304/F316/F316L, F51/F53 Duplex Stainless Steel
Ball: A182 F304/F316/F316L, F51/F53 with ENP coating, A105 with hard chrome plating
Stem: A182 F6a, F304/F316, 17-4PH, XM-19
Seats: PTFE, RPTFE, Nylon, PEEK, metal hard seal (Stellite overlay)
Bearings/Bushings: PTFE + stainless steel, Devlon, PEEK self-lubricating materials
Sealing Materials: PTFE, RPTFE, graphite, metal seal
End Connections: Flanged (RF/RTJ) to ASME B16.5; optional Butt-Weld (BW)
Operation: Manual (worm gear / lever), pneumatic, electric, hydraulic, electro-hydraulic
Design Standards: API 6D, API 608, ASME B16.34
Testing Standards: API 6D, API 598
Face-to-Face Dimensions: ASME B16.10
Applications
Oil & Gas Long-Distance Pipelines: Main line block valves, compressor station inlet/outlet valves, pig launcher/receiver isolation valves for high-pressure large-flow natural gas and crude oil transmission.
Petrochemical Industry: Medium isolation in high-pressure reaction systems, separation systems and storage & transportation systems of refineries and chemical plants.
Power Industry: Large-bore high-pressure control for fuel systems, cooling water systems and steam systems in gas-fired power plants.
LNG Industry: High-pressure cryogenic media control for LNG terminals, liquefaction plants and regasification stations (cryogenic materials optional).
Coal Chemical Industry: Isolation of high-pressure syngas and oxygen media in coal gasification and coal-to-liquid plants.
Offshore Engineering: High-pressure production manifolds and riser systems for offshore platforms and FPSOs.
Underground Gas Storage: High-pressure and high-frequency switching service for injection-production wellheads and gathering stations.
Advantages & Value
Light & Reliable Operation: The low-torque trunnion design reduces actuator size and energy consumption, with better long-term stability than floating ball valves.
Multiple Safety Guarantees: DPE double piston effect, DBB/DIB isolation and bleed, fire-safe and anti-static design meet the most stringent safety standards.
Flexible Configuration: Soft or metal hard seal, low/high temperature materials, various operation modes and functional options cover a wide range of working conditions.
International Standard Certifications: API 6D, ISO 14313 and other certifications ensure global project access and support international procurement and interchangeability.
Intelligent Upgradeability: Equippable with position monitoring, online diagnosis and predictive maintenance systems to support smart pipelines and digital factories.
